DARWIX'S BIOGRAPHY. 449 



principle. To Darwin the outer, separate uni- 

 verse of Nature becomes an inner harmonious 

 unified universe through Evolution by Nat- 

 ural Selection, which is the central mediating 

 principle. And just that is also the unity of 

 his life evolving through its three periods. 

 He mediated himself in his own crude imme- 

 diate state with his universal Self; and so 

 completely did he live this process that he was 

 the mediator in the sphere of Nature for his 

 age. 



Thus he goes back to his voyage externally, 

 and makes the inner circumnavigation of Na- 

 ture, avoiding Classics, Medicine and Theol- 

 ogy to the last. "We may observe him branch- 

 ing from his central principle in his next ex- 

 tensive work, Variation of Animals and 

 Plants Under Domestication. This contains 

 his theory of Pangenesis, which " implies that 

 every separate part of the whole organization 

 reproduces itself" through the so-called gem- 

 mules. Next we may place The Descent of Man 

 (1871), in which the transmutation of the spe- 

 cies is applied to the human being which ap- 

 plication the author had avoided in the Origin 

 of Species. This is, of course, the most im- 

 portant application and has given to Darwin- 

 ism its greatest fame, as it affirms that man 

 had come through "a pithecoid ancestor.' 1 

 But we shall have to forego any special des- 

 ignation of the rest of his works. 



